/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

const promise = new Promise(function (resolve, reject) {
  var a = 'hello';
  resolve(a);
})
promise.then(function (value) {
  var b = 'lagou';
  return value + b;

}).then(function (value) {
  var c = 'I ♥ U'
  console.log(value + c);
});